• ** REMEMBER! **The microwave can still shock you even unplugged!!

    ALWAYS discharge the high-voltage capacitor first if you even think your hands will come close to any HIGH VOLTAGE components.

    Jeff mentions this: Anything in the high voltage ( magnetron, capacitor, diode, wires to and from ):
    ...Use a metal ( not the shiny chrome type ) screw driver with a insulated handle to short across ( touch both at the same time ) the terminals of the high voltage capacitor to discharge it.

    From Jeff's site: http://www.applianceaid.com/component-testing.php

    Jake
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FIXED Samsung microwave ME21H706MQG stays powered up 10 minutes, loud hum while idle

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RepairAll

Premium Member
Joined
Jan 6, 2021
Messages
4
Location
Gulfport, ms
Model Number
ME21H706MQG
Brand
Samsung
Age
1-5 years
MW Only stays powered up for about 10 minutes. Has a loud hum while sitting idle. Hum will quit when door is opened.
Top and R-side case get hot, smells hot, than goes dead black. Seems to reset itself and will repeat after it cools down about an hour.
Transformer bad? Switch's bad?
Something is causing a load, get's hot and lose's all power.
Any Help? Please
 

rickgburton

Appliance Tech - Moderator
Staff member
Joined
Jul 11, 2006
Messages
44,788
Location
Murray, Utah 84107, United States
Has a loud hum while sitting idle.
Sounds like the control board. Nothing should be powered when it's off. Check to see if you have any voltage going to the transformer when it's off.
samsung-assy-pcb-main-de92-03624d-ap5957984_01_m.jpg
 

RepairAll

Premium Member
Joined
Jan 6, 2021
Messages
4
Location
Gulfport, ms
Rick; tnks for the reply. Makes sense what you say. What I'm hearing is the mw tube, but no fan is causing the over heat issue
and eventual thermo safety shutdown.
Any Idea if the relays on the CB are available individually.
 

rickgburton

Appliance Tech - Moderator
Staff member
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Messages
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Location
Murray, Utah 84107, United States
Any Idea if the relays on the CB are available individually.
I couldn't tell you. It's probably a stuck relay but can be almost anything.
 

RepairAll

Premium Member
Joined
Jan 6, 2021
Messages
4
Location
Gulfport, ms
Of the two larger relays, the one closest to the row of 9-small relays is powered up. When-----------------
unit is plugged in but not activated, (Idle).
 

rickgburton

Appliance Tech - Moderator
Staff member
Joined
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Messages
44,788
Location
Murray, Utah 84107, United States
I don't have the wiring diagram for that model. Without it I couldn't tell you what that relay is.
 

RepairAll

Premium Member
Joined
Jan 6, 2021
Messages
4
Location
Gulfport, ms
Goes to the transformer on bottom of case. Tapped on relay and it released. All is working normal.
Thanks again 4 the help.
 
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